It’s called Spicylinks:
SpicyLinks is an automated link-blog summariser. It reads other people’s link-blogs, so you don’t have to, and reports the stuff that prove popular in your personal collection of sources.
A little bit of hacking has come up with an interesting twist: take a del.icio.us social network, a CGI script called deliciousnetwork2opml.cgi, and 15 minutes hacking on SpicyLinks to support inclusion of OPML via a remote URI, and hey presto — it’s now a social-network summarising aggregator. 😉
So it’s like your del.icio.us social network but with noise reducers and you can choose your level of ear fluffiness for the noise.